Int 2F/AX=4330h

HIMEM.SYS v2.77+ - GET EXTERNAL A20 HANDLER ADDRESS

AX = 4330h

Return:
AL = 80h if external A20 handler provided
ES:BX -> external A20 handler (see #02790)
CL = A20 detection support
00h handler is unable to report A20 state
01h handler supports function 0002h to report A20 state

Note: HIMEM.SYS calls this function to allow an external program to provide an A20 handler (i.e. to support a machine not supported by HIMEM itself)

See Also: AX=4308h - AX=4310h



(Table 02790)
Call parameters for external A20 handler are:.
AX = function
0000h disable A20
0001h enable A20
0002h get A20 state

Return:
AX = status (functions 0000h and 0001h)
0000h failure
0001h successful
AX = A20 state (function 0002h)
0000h disabled
0001h enabled

Note: HIMEM.SYS only calls function 0002h if the returned CL indicated that the handler supports the call

Category: Memory Management - Int 2Fh - H

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